Georgieva Д. Theory of probability and combinatorics in the school course of mathematics. Mathematics and Education in Mathematics, [S. l.], v. 52, p. 166–171, 2023. DOI: 10.55630/mem.2023.52.166-171. Disponível em: https://smb.math.bas.bg/mem/index.php/memjournal/article/view/82. Acesso em: 7 oct. 2026.